* fix: NullReferenceError while deleting a GameObject with parameter usage UI open
* fix: NullRefException from editor when moving a Menu Installer outside of an avatar
Changes in 1.9.0 broke existing avatars that used animators with
different default values than the MA Parameters fields. This change
makes overriding the animator defaults require an explicit configuration;
this is technically a change which would require a minor version bump,
but as this is addressing a major-version-level compatibility break in 1.9.0,
we're going to push this out at a minor version this time.
* add referenced assembly
* remove unused usings
* MA Merge Blend Tree is VRC specific
because it expects VRC style Animator Layer setup
* PruneParametersPass is VRChat specific
* fix: use FindAvatarTransformInParents() to be more cross platform
* fix MergeArmatureHook: nop logic for PhysBones if we do not dedup PhysBones
* fix AnimatorCombiner: ignore VRC components when non-VRC
btw, is AnimatorCombiner VRC specific?
* conditional compile some VRChat specific tests
* chore: refactor state machine clone logic out as a separate class
* feat: add layer priority and relative path root options to Merge Animator
* feat: add Merge Blend Tree component
* chore: adjust NDMF dependency
* docs: update merge-animator docs
* docs: merge blend tree docs
* chore: rearrange package structure to have the package at the root
* ci: update CI workflows
* ci: fixing workflow bugs
* ci: recurse building .zip package
* ci: more fixes
* ci: add back in the nadena.dev VPM repo
* ci: fix tests
